摘要
针对某卡车发动机舱热回流现象,建立整车有限元模型,选择最大扭矩和额定功率为危险工况,进行发动机舱流场和温度场的分析。不考虑辐射散热影响,根据流场分析,确定热回流位置;考虑辐射散热影响,根据温度分析,得出前舱温度明显高于环境温度,发动机前舱存在严重的热回流。据此,采用中冷器底部添加导流板和车架内侧增加阻流板的改进设计,仿真结果表明:改进设计增加了冷却系统的进气量,改善了发动机舱空气的流动和温度分布。最后,通过试验验证了计算方法和模型的正确性。
To cope with thermal backflow phenomenon in some truck underhood, the truck finite element model was establishecL For simulating internal flow and temperature distribution, maximal torque and rated power were chosen as dangerous conditions. Regardless of radiation, serious backflow was found according to the analysis of flow field; considering radiation, the front underhood temperature was obviously higher than environmental temperature by the temperature distribution, which proved the existence of serious thermal backflow. Accordingly, the modification of adding guide plate and barrier plates was carried out. Simulation results showed the modifcation increased the amount of intake air of cooling system and effectively improved the underhood airflow and temperature. Finally, the calculation method and model was verified by test.
出处
《机械设计与制造》
北大核心
2014年第4期168-171,共4页
Machinery Design & Manufacture
基金
江苏省产学研前瞻性联合研究项目(BY2009109)
